Data come from a study of breast cancer in Wisconsin. There are 681 cases of potentially cancerous tumors of which 238 are actually malignant. Determining whether a tumor is really malignant is traditionally determined by an invasive surgical procedure. The purpose of this study was to determine whether a new procedure called fine needle aspiration which draws only a small sample of tissue could be effective in determining tumor status.
data(wbca)A data frame with 681 observations on the following 10 variables.
Class0 if malignant, 1 if benign
Adhesmarginal adhesion
BNuclbare nuclei
Chrombland chromatin
Epithepithelial cell size
Mitosmitoses
NNuclnormal nucleoli
Thickclump thickness
UShapcell shape uniformity
USizecell size uniformity
The predictor values are determined by a doctor observing the cells and rating them on a scale from 1 (normal) to 10 (most abnormal) with respect to the particular characteristic.